anonymous
  • anonymous
the surface tension of which of the following liquid is maximum? a)H20 b)C6H6 c)CH3OH d)C2H5OH
Physics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I guess is H20
anonymous
  • anonymous
yea i too but on phyics can we apply chemistry by seeing str. we can ay or here it is another concept??
anonymous
  • anonymous
i guess H20 have two hydrogen bonds. so, it should have the highest surface tension

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anonymous
  • anonymous
uhmm one more correct me if i m wrong surface tension means large surface area rit so by seeing str. we can say H2O is having max. surface tension
TuringTest
  • TuringTest
No, surface tension has to do with the polarity of the molecules. H2O is polar, and so the molecules at the surface are being pulled together by electrostatic forces. I don't think the other molecules on the list are polar (or at least as polar).
anonymous
  • anonymous
ok so we will consider here polarity.. ok thnx
TuringTest
  • TuringTest
That's my best guess at least. I'm a little rusty in chem, so I'm assuming the other molecules are not as polar. Welcome!
anonymous
  • anonymous
hey i dont need a guess.. ok just tell me the one abu definition i told abu surface tension is it rit or wrong??
anonymous
  • anonymous
had a look at my new ques plz..
Shayaan_Mustafa
  • Shayaan_Mustafa
At 20C in mN/m Surface Tension of Water: 72.80 Surface Tension of Benzene: 28.88 Surface Tension of Methanol: 22.70 Surface Tension of Ethanol: 22.10
anonymous
  • anonymous
how u calculate the ST of water??
anonymous
  • anonymous
u learned theses values??
Shayaan_Mustafa
  • Shayaan_Mustafa
During the course of Solid state physics I taught them. and remember them. If want to calculate them then you have to perform experiments. These are experimental values. And different on different temperatures.
Shayaan_Mustafa
  • Shayaan_Mustafa
If you want to calculate surface tension. then may be i could help you. Now.
anonymous
  • anonymous
ah.. not intersted in physics just doing my hw :) so i was thinking why dats y i asked thnx
Shayaan_Mustafa
  • Shayaan_Mustafa
hmmmm....... well jesa ap chahen madam.
anonymous
  • anonymous
lolz.. no madam plz.. better cal me kirti or heena
Shayaan_Mustafa
  • Shayaan_Mustafa
ok heena. sorry. may i ask you something if you don't mind. please.
anonymous
  • anonymous
ok now there are two buble of diff. radii .the exces presure outside to inside is?? a)more in big drop b)more in small drop c)equal in both d)there is no excess pressure inside the drops
anonymous
  • anonymous
yea sure say?
Shayaan_Mustafa
  • Shayaan_Mustafa
let me analyze the situation. wait
Shayaan_Mustafa
  • Shayaan_Mustafa
ok i got the answer. From the concept of Buoyant force. Bigger area receive more pressure then small. so a) is correct.
anonymous
  • anonymous
ans is B now find the reason
Shayaan_Mustafa
  • Shayaan_Mustafa
do you know the formula of pressure? it is P=F/A less area receive more pressure. more area receive less pressure.
Shayaan_Mustafa
  • Shayaan_Mustafa
Yeah I know. I made mistake up there. Therefore i used formula here. kindly correct. it is supposed to be b).
Shayaan_Mustafa
  • Shayaan_Mustafa
now it is clear to you? heena or kirti.
anonymous
  • anonymous
oh yes so easy dumbo me nevr use mind well anyway thx...
Shayaan_Mustafa
  • Shayaan_Mustafa
my pleasure.

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